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United States Patent | 5,098,690 |
Koves | * March 24, 1992 |
A method for gas solids contacting uses a two direction distributor to prevent bed surface disturbances at high inlet velocities and high particle loadings. The distributor uses a series of partitions to peel off portions of the downward gas flow and redirect them radially outward. Each outwardly directed gas flow component passes through a series of perforations to effect any necessary circumferential redistribution before entering the space above the particle bed. By subdividing the gas flow into a number of radially directed flow portions and circumferentially redistributing these flow portions, cross-currents and eddy currents on the catalyst bed surface are minimized or avoided so that disturbances at the bed surface are eliminated. This distributor is particularly effective in vessels having particles loaded to within a short distance of bed inlets and where elbows or other upstream flow devices introduce nonuniformities into the gas flow to a particle bed. The distributor has a simple arrangement and can be used without adding significant pressure drop to the system.
Inventors: | Koves; William J. (Hoffman Estates, IL) |
Assignee: | UOP (Des Plaines, IL) |
[*] Notice: | The portion of the term of this patent subsequent to July 3, 2007 has been disclaimed. |
Appl. No.: | 547574 |
Filed: | July 2, 1990 |
Current U.S. Class: | 423/659; 239/533.1; 422/129; 422/220 |
Intern'l Class: | B01J 008/02 |
Field of Search: | 422/129,198,195,310,312,220 239/553,553.3,553.5 |
2517525 | Aug., 1950 | Cummings | 422/195. |
2639224 | May., 1953 | McAfee | 422/220. |
2925331 | Feb., 1960 | Kazmierczak et al. | 23/288. |
3479146 | Nov., 1969 | Hochman | 239/553. |
3598541 | Aug., 1971 | Hennemuth et al. | 23/288. |
3598542 | Aug., 1971 | Carson et al. | 23/288. |
3669628 | Jun., 1972 | Latham, Jr. et al. | 422/198. |
4340501 | Jul., 1982 | Davidson | 422/198. |
4938422 | Jul., 1990 | Koves | 239/553. |
Foreign Patent Documents | |||
729729 | Nov., 1942 | DE2 | 422/129. |
1031496 | Mar., 1982 | SU | 422/220. |